JPH0559304A - Aqueous emulsion paint - Google Patents

Abstract

PURPOSE:To provide an aqueous emulsion paint capable of preventing exudation of a stain such as smoke of a cigarette on the surface of a material to be coated on the coating surface in formation of a film of the aqueous emulsion paint. CONSTITUTION:Based on 100 pts.wt. solid matter of the emulsion resin in a paint, activated alumina and/or activated earth as a pigment are/is blended in an amount of 10-300 pts.wt., preferably 50-200 pts.wt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous emulsion paint suitable for painting indoor surfaces such as indoor wall surfaces and ceilings which are contaminated with cigarette smoke, oil smoke, hand dust and the like.

[0002]

2. Description of the Related Art Aqueous emulsion paints are generally used for repainting walls, ceilings, etc. of interiors of buildings, general houses and vehicles, etc., from the viewpoint of environmental hygiene and the Fire Service Act. There are many. However, their interior surfaces are often contaminated with cigarette smoke, oil smoke, hand dust, etc.
After painting, these contaminants may exude to the painted surface and spoil the appearance. In particular, pollutants such as cigarette smoke have many water-soluble components, which become remarkable when an aqueous emulsion paint is applied.

Therefore, it is practically difficult to use the water-based paint when the white or light-colored paint finish is applied to the surface to be coated which is contaminated by the smoke of cigarettes, and the organic solvent-based paint is unavoidably used. The current situation.

[0004]

Means for Solving the Problems From the viewpoint of improving the coating work environment, the present inventors have made earnest studies to prevent the leaching of contaminants in an aqueous emulsion paint, and as a result, have found that a special pigment is added to the aqueous emulsion paint. By blending,
The present invention has been completed by finding that the exudation of the contaminants can be prevented.

That is, the present invention relates to an aqueous emulsion paint characterized by containing activated alumina and / or activated clay as a pigment component.

The coating composition of the present invention contains activated alumina and / or activated clay having an adsorbing ability as an essential component, and the contaminants dissolved in the coating film by a coating solvent are adsorbed on these to give a coating film surface. It is possible to prevent the exudation to the.

As the resin emulsion which is the vehicle component of the coating composition of the present invention, any of those conventionally used as a vehicle in the field of aqueous emulsion coating compositions can be used. For example, acrylic, acrylic-styrene,
Resin-based emulsions such as vinyl acetate, vinyl acetate-acryl, ethylene-vinyl acetate, epoxy, urethane alkyd; emulsions such as natural or synthetic rubber latex, and the like, which may be used alone or in combination of two or more. ..

Activated alumina and activated clay which are dispersed as essential components in the above resin emulsion are compounds having a porous structure having a large adsorptive ability, and industrially, degreasing and refining of fats and oils and petroleum mineral oils, etc. Is used for.

The activated alumina is obtained by calcining alumina hydrate such as gypsite, boehmite, bayerite, and amorphous hydrated gel at an appropriate temperature, usually 200 to 1000 ° C. Transition alumina). Activated alumina is also called gamma-alumina. As commercially available products, activated alumina KC-501, KC-503 and gamma-alumina A- manufactured by Sumitomo Chemical Co., Ltd.
11; such as DN-1A manufactured by Mizusawa Chemical Co., Ltd. Activated clay is obtained by treating acid clay, which is a type of clay containing montmorillonite group clay minerals and soluble silicic acid as main components, with an acid to elute a part of basic components. As a commercially available product, activated clay from Japan Activated Clay Co., Ltd.,
Galleon Earth NV manufactured by Mizusawa Chemical Co., Ltd.
And so on.

Prior to the present invention, similar to activated alumina and activated clay, inorganic compounds containing elements such as aluminum and silicon, specifically silicon dioxide, aluminum oxide, diatomaceous earth, talc, clay and mica. However, the effect of adsorbing pollutants was poor.

Activated alumina and // in the coating composition of the present invention
Alternatively, the total amount of the activated clay is 10 to 30 relative to 100 parts by weight of the solid content of the emulsion resin in the paint.
A range of 0 parts by weight is suitable, and further 50 to 200.
It is more preferably in the range of parts by weight. Compounding amount is 10
If the amount is less than 300 parts by weight, the ability to adsorb pollutants cannot be fully exerted, while if the amount is more than 300 parts by weight,
Problems such as storability and adhesion tend to occur.

The coating composition of the present invention comprises a resin emulsion,
In addition to activated alumina and / or activated clay, titanium white, red iron oxide, carbon black, and
Coloring pigments such as phthalocyanine blue, phthalocyanine green and azo red; extender pigments usually used in the paint field such as calcium carbonate, talc, clay, silica, barita and mica; solvents; dispersants, thickeners, decolorizers. Foaming agents, film-forming aids, preservatives, antifreeze agents, and other paint additives can be contained.

In the coating composition of the present invention, the volume ratio (PVC) of all pigments (including activated alumina and / or activated clay) to the total solid content in the coating composition is preferably 70% or less. The range of 60% is more preferable. As PVC becomes larger than 70%, the denseness of the coating film is lowered, and when it is applied on the object to be coated on which the contaminants are present, the sufficient stain-proofing effect cannot be exerted.

The method for producing the coating composition of the present invention is not special and can be carried out by a method known per se. For example, it can be carried out by adding a pigment component and, if necessary, water or an additive for paints to the resin emulsion, and uniformly dispersing by a known means such as a stirrer.
The coating composition of the present invention can be appropriately used as the top coating composition and the undercoat coating composition.

[0015]

The coating composition of the present invention contains activated alumina and / or activated clay having an adsorbing ability in the coating composition. Therefore, when a coating film is formed on an object to which contaminants are attached, the coating film Activated alumina and / or activated clay can adsorb the contaminants dissolved therein to prevent the contaminants from seeping out to the surface of the coating film. Further, since the coating material of the present invention is water-based, it is possible to repaint walls, ceilings, etc. in a room contaminated with cigarette smoke and the like without impairing the coating work environment.

[0016]

EXAMPLES The present invention will be described in more detail below with reference to examples. In the following, "parts" and "%" are based on weight unless otherwise specified.

Production Example 1 242 parts of deionized water and N in a 2-liter four-necked flask.
2.4 parts of ewcol 707SF (manufactured by Nippon Emulsifier Co., Ltd., an anionic surfactant having a polyoxyethylene chain, solid content: 30%) was added, and the temperature was maintained at 80 ° C. after purging with nitrogen. To this, 0.7 part of ammonium persulfate was added, and 15 minutes after the addition, a pre-emulsion having the following composition was added dropwise over 3 hours.

Deionized water 352 parts Newcol 707SF 64.5 parts Methyl methacrylate 201 parts Styrene 134 parts n-Butyl acrylate 321 parts Acrylic acid 13.4 parts Ammonium persulfate 1.3 parts Ammonium persulfate after 30 minutes from the end of dropping A solution prepared by dissolving 0.7 parts in 7 parts of deionized water was added dropwise over 30 minutes, and after completion of the addition, a further 2 hours 80
After keeping the temperature at ℃, it was cooled to 45 ℃, further adjusted to pH 9 by adding aqueous ammonia, to obtain an emulsion liquid (I). The resin solid content of this emulsion liquid (I) was about 50.8%.

Example 1 A stainless steel container having a volume of 0.5 liter was mixed with the following composition and stirred with a stirrer for 30 minutes to obtain a pigment paste. Water supply 100 parts Ethylene glycol 5 parts Nopco spar 44C (Note 1) 2 parts SN deformer 364 (Note 2) 2 parts Fuji Chemie HEC KF-100 (Note 3) 1 part Titanium white 140 parts Activated alumina KC-503 (Note 4) 50 Part Tancal (Note 5) 80 parts (Note 1) San Nopco Ltd. pigment dispersant (Note 2) San Nopco Ltd. defoamer (Note 3) Fuji Chemical Co., Ltd. thickener (Note 4) Sumitomo Chemical Co., Ltd. adsorptive pigment, activated alumina (Note 5) Takehara Chemical Industry Co., Ltd. extender pigment, calcium carbonate Emulsion liquid (I) 200 obtained in Production Example 1 to 380 parts of the obtained pigment paste. Parts and 12 parts of isopropionic acid (2,2,4-trimethyl-3-hydroxypentyl) ester were mixed and stirred for 10 to 20 minutes to obtain a coating material A. The PVC in paint A was about 44% by volume.

Examples 2 to 4 and Comparative Example 1 Example 1 is the same as Example 1 except that the pigment composition in the production of the pigment paste is as shown in Table 1 below.
The same procedure was followed to obtain coatings B, C, D and E.

[0021]

[Table 1] (Note 6) Adsorbent pigment manufactured by Japan Activated Shirato Co., Ltd. (Note 7) Aluminum silicate-based extender pigment manufactured by Buzilite Co., Ltd.

Comparative Examples 2 and 3 Commercially available vinyl deluxe 300 white (manufactured by Kansai Paint Co., Ltd., acrylic copolymer emulsion paint, JIS
K5663 type 1 product) was used as Comparative Example 2, and commercially available EP Sealer White (Kansai Paint Co., Ltd., acrylic copolymer emulsion undercoat paint) was used as Comparative Example 3.

Test Example 4 × 70 × 150 mm flexible plate (JIS A54
(03 compatible product) was coated twice with a brush with a vinyl deluxe 300 white so that the dry coating amount would be about 100 g / m ² . This coated plate was kept at 20 ° C.-65% R. H. The coated plate for a test was obtained by drying under the conditions of. This test coated plate 3
One sheet was prepared, and a circle with a diameter of 4 cm was drawn in the center of one of the sheets with an oil-based marking pen black (JIS S6037 compliant product), and the inside of the circle was filled. For the remaining one coated plate, a water-based marking pen black (JI
The circle was filled in the same manner except that S 6037 conforming product) was used. On the last coated plate, add 500 cc of methanol to 50 g of dried tobacco leaves, leave it at room temperature for one day, and extract the nicotine-containing extract in the same manner except using the black marking pen instead of the oil-based marking pen. It was

The three types of contaminated coated plates obtained as described above were coated with the coating material A diluted to a coating viscosity with tap water to a dry coating amount of about 75.
After applying a brush so as to be g / m ² and drying at room temperature for 48 hours, the degree of exudation (contamination resistance) of contaminants on each coated plate was visually determined. The results are shown in Table 2.

In the above test example, the same procedure as in the above test example was carried out except that each of the paints of Examples 2 to 4 and Comparative Examples 1 to 3 was used instead of the paint A as shown in Table 2. The results are shown in Table 2.

[0026]

[Table 2]

(Note 8) The evaluation criteria for stain resistance are as follows. ⊚: Almost no bleeding of contaminants is observed. ◯: Light bleeding is recognized, but there is no practical problem. Δ: Significant bleeding can be confirmed. X: Exudation was observed on the entire surface, and discoloration of the painted surface was remarkable.

Claims (3)

[Claims] 1. An aqueous emulsion paint comprising activated alumina and / or activated clay as a pigment component. 2. The solid content of the emulsion resin in the paint is 10
The aqueous emulsion paint according to claim 1, wherein the amount of activated alumina and / or activated clay is 10 to 300 parts by weight based on 0 part by weight. 3. The water-based emulsion paint according to claim 1, wherein the volume ratio (PVC) of all pigments to the total solid content in the paint is 70% or less.